Docs: Image Optimizer

Optimize all your images for free (Pro version only), but best is to do that after you are satisfied with the autoconfig configuration as described above.
With Image Optimizer you can optimize every image on your site. It will scan the whole site, and pick up every image from themes, plugins and...

What is a scaled image?
A scaled image is an image whose size matches exactly with the size defined in CSS or HTML. Let’s say a user of a website uploads a 400 x 400 dimension picture and uses it as a thumbnail of 40 x 40 using HTML/CSS. This means that the browser will have to download the large f...